# A square tank has

Let the length of side of the square tank be a

Area of square tank = a2 = 1600 m2

a = √1600 m = 40 m Let the radius of semicircle be R

From the figure we can see that

Length of the side of the square = Diameter of semicircle

40 m = 2 × R

R = 40/2 m

R = 20 m

Area of semi-circle = 1/2 R2 = 1/2 × 3.14 × 20 × 20 m2

= 628 m2

Area of 4 semi-circles = 4 × 628 m2

= 2512 m2

Cost of turfing the plots = Rs. 12.50 per m2

Cost of Turfing = Cost of turfing per m2 × Area of 4 semicircle

= Rs. 12.50 × 2512

= Rs. 31400

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